clusterStatus needs to be initialized before metrics
clusterStatus needs to be initialized before metrics

Initializing metrics creates a goroutine to send stats everysecond
one of the stats is the clusterStatus.  If metric-tank is slow
to start up due to waiting for external services like cassandra,
the stats collection could happen before clusterStatus was
initialized causing a panic.

raintank/metrictank,replay/metrictank,OOM-Killer/metrictank,replay/metrictank,raintank/metrictank,replay/metrictank,raintank/raintank-metric,replay/metrictank,raintank/metrictank,raintank/raintank-metric,OOM-Killer/metrictank,OOM-Killer/metrictank,raintank/metrictank,raintank/raintank-metric